Web based inventory tool and multi eBay id manager?

I have 5 eBay accounts for different sites: UK, DE, US. What I need is an inventory tool as well as multi eBay id manager. When I have a new product, I'm able to post many items in different eBay sites. eBay messaging functionality is a big plus. I've been using Auctiva for more than one year. It's stable but... Anyway, please suggest a software that I can use for my requirements. Thanks in advance.

[Last edited by moderator: Added more information to title — 19 Apr 2010]